Device for preparing liquefied natural gas with pipeline pressure energy and application method thereof

A technology for liquefied natural gas and pipeline pressure, applied in the field of equipment for preparing liquefied natural gas, can solve problems such as difficult guarantee, blockage of liquefaction equipment, high liquefaction rate, etc., and achieve the effect of low cost, high efficiency and simple process

Active Publication Date: 2013-06-26
合肥万豪能源设备有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The publication number is CN202393170U, and the utility model patent titled "Double-Circuit Dual-Expander Pressure-Difference Type Energy-Saving Liquefaction Device of Natural Gas Transmission Trunk Line" adopts the parallel connection of dual expanders to use the pressure difference of the gas transmission trunk line to reach the purpose of liquefied natural gas. This technology does not separate heavy hydrocarbons in the process of natural gas liquefaction, which may lead to consequences such as blockage of the liquefaction unit. In addition, this technology is mainly aimed at the utilization of the pressure difference between the main gas transmission pipeline of 8.0-10.0MPa and the distribution station of 4.0MPa. It is difficult to ensure a high liquefaction rate when the pressure difference is small

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  • Device for preparing liquefied natural gas with pipeline pressure energy and application method thereof

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Embodiment 1

[0029] This embodiment relates to a device for preparing liquefied natural gas by using pipeline pressure energy. Heater 5, second-stage splitter 6, second-stage heat exchanger 7, heavy hydrocarbon separator 8, first-stage expander 9, third-stage heat exchanger 10, fourth-stage heat exchanger 11, second A first-stage expander 12, a throttle valve 13, a gas-liquid separator 14, a third-stage flow divider 15, a second-stage supercharger 16, and a second-stage water cooler 17, the structure of which is as follows figure 1 Shown:

[0030] This embodiment also relates to a method for preparing liquefied natural gas using the aforementioned device, the method comprising the following steps:

[0031] Step 1, divide the molar composition into 95% CH 4 and 5%N 2 Natural gas with a pressure of 4 MPa, a temperature of 15°C and a flow rate of 1 kmol / h passes through the first stage splitter 1 to form the first line and the second line. The volume percentage of the natural gas entering ...

Embodiment 2

[0038] This embodiment relates to a device for preparing liquefied natural gas by using pipeline pressure energy. Heater 5, second-stage splitter 6, second-stage heat exchanger 7, heavy hydrocarbon separator 8, first-stage expander 9, third-stage heat exchanger 10, fourth-stage heat exchanger 11, second A first-stage expander 12, a throttle valve 13, a gas-liquid separator 14, a third-stage flow divider 15, a second-stage supercharger 16, and a second-stage water cooler 17, the structure of which is as follows figure 1 Shown:

[0039] This embodiment also relates to a method for preparing liquefied natural gas using the aforementioned device, the method comprising the following steps:

[0040] Step 1, divide the molar composition into 95% CH 4 and 5%N 2 , natural gas with a pressure of 4 MPa, a temperature of 15°C, and a flow rate of 1 kmol / h passes through the first-stage splitter 1 to form the first line and the second line. The volume percentage of the natural gas enteri...

Embodiment 3

[0047] This embodiment relates to a device for preparing liquefied natural gas by using pipeline pressure energy. Heater 5, second-stage splitter 6, second-stage heat exchanger 7, heavy hydrocarbon separator 8, first-stage expander 9, third-stage heat exchanger 10, fourth-stage heat exchanger 11, second A first-stage expander 12, a throttle valve 13, a gas-liquid separator 14, a third-stage flow divider 15, a second-stage supercharger 16, and a second-stage water cooler 17, the structure of which is as follows figure 1 Shown:

[0048] This embodiment also relates to a method for preparing liquefied natural gas using the aforementioned device, the method comprising the following steps:

[0049] Step 1, divide the molar composition into 90% CH 4 and 10%N 2 , natural gas with a pressure of 5 MPa, a temperature of 15°C, and a flow rate of 1 kmol / h passes through the first-stage splitter 1 to form the first line and the second line. The volume percentage of the natural gas enter...

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Abstract

The invention provides a device for preparing liquefied natural gas with pipeline pressure energy and an application method thereof. The device is composed of a first-level shunt, a first-level supercharger, a natural gas purifier, a first-level water cooler, a first-level heat exchanger, a second-level shunt, a second-level heat exchanger, a heavy hydrocarbon separator, a first-level expansion machine, a third-level heat exchanger, a fourth-level heat exchanger, a second-level expansion machine, a throttle valve, a gas-liquid separator, a third-level shunt, a second-level supercharger, and a second-level water cooler. The invention further relates to a method for preparing liquefied natural gas with the device. According to the method, the pressure energy of a natural gas pipeline network can be utilized, high-pressure natural gas expansion cooling is directly utilized, the liquefaction of natural gas is achieved, and energy from the outside is not needed. The technological process of liquefaction can achieve the natural gas liquefaction ratio of 10-17% through appropriate parameter regulation. By means of the method, process is simple, efficiency is high, cost is low, and application prospects are broad.

Description

technical field [0001] The invention belongs to the technical field of chemical engineering and cryogenic engineering, and in particular relates to a device and a method for using pipeline pressure energy to prepare liquefied natural gas. Background technique [0002] As the main fossil energy in the world, natural gas, oil and coal account for a large proportion of primary energy. Natural gas is a high-quality clean energy, and more and more countries have begun to pay attention to the development and utilization of natural gas resources. [0003] The large-scale transportation of natural gas mainly adopts pipeline transportation. At present, most of the long-distance natural gas in my country is transported by high-pressure pipelines. For example, the pressure of the West-East Gas Pipeline reaches 10MPa. It is supplied to users after low pressure. Natural gas pressure regulation usually uses a throttle valve, and a large amount of pressure energy will be lost in the proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J1/00F25J3/08
Inventor 巨永林贺天彪
Owner 合肥万豪能源设备有限责任公司
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